Trimming machine



May l`5, 1945- F. c. LovEJoY ETAL 2,375,803

TRIMMING MACHINE Filed April 18, 1944 2 Sheets-Sheet l nmsfnorgs` Fred @Lovejoy L inusW-Bux'on May 15, 1945. F C, OVEJOY 'ETAL 2,375,803

TRIMMING MACHINE I Filed April 18, 1944 2 Sheets-Sheet- 2 by. Z

Patented May 15, 1945 TRIMMING MACHINE Fred Chase Lovejoy and Linus Waldo Buxton,

St. Louis, Mo., assignors to United Shoe Machinery Corporation, Flemington, N. J., a corporation of New Jersey Application April 18, 1944, Serial No. 531,580

8 (Jlairns. (Cl. 12-49.1)

cation filed in the name of William H. Nutt, itl

is common practice in covering Cuban wood heels, for example, to apply a single cover to the rear and side faces of the heel and thereafter to inturn the forwardly projecting portions of the cover onto the opposite lateral portions of the breast of the heel, the margins of said projecting portions being tucked into a channel extending heightwise along the central portion of the breast of the heel. It is desirable that the projecting margins of the cover shall extend well into but notquite to the bottom of the channel, and it has been found by experience that it requires a substantial amount of time properly to trim the projecting portions of the covers preparatory to applying them to the heel. The trimming operation is performed to a considerable extent by the use of hand shears, but it is also carried out by the use of a machine such as disclosed in United States Letters Patent No.

1,752,774, granted April 1, 1930, on an applicaance with a feature of the present invention,-

there are provided a Work support having a shearing edge, means for positioning with relation to the support a heel having a cover-receiving channel, a clamp for positioning upon the support a projecting margin of a cover secured to the heel, a cutting blade movable past the shearing edge of the support to trim portions of the cover margin extending beyond said shearing edge, and means associated with the cutting blade and` the clamp for operating the clamp in response to movement of the cutting blade to force said projecting margin of the cover against the support and then for causing the clamp to remain practicallystationary in forced' engagement with the work while said blade effects its trimming operation',

The cutting blade and the clamp are mounted for pivotal movement about spaced parallel axes respectively and are constantly urged by coil springs toward their raised idle positions away from the work support'. The work support has secured to it a gage having the form of a rib constructed and arranged to occupy the coverreceiving channel which is formed in the breast of the heel, the rib being so positioned that one of the forwardly projecting margins of the cover of the heel is spaced from but extends over a iiat upper surface of the support.

Movable together With the cutting blade is a roll constructed and arranged upon downward pivotal movement of the blade to engage a fiat upper cam surface of the clamp, causing the clamp tobe moved downwardly past the breast edge of the heel beyond which the projecting margin of the cover extends, thereby inturning the cover toward the breast of the heel and forcing a portion of the projecting margin against the upper surface of the support. When the clamp has been moved into forced engagement with the Work, the roll is moved into engagement with the upper end of a forward cylindrical cam surface of the clamp, said surface being eccentric with relation to the axis about which the clamp is moved and, when the clamp is in engagement with the cover margin on the support, being practically concentric with the axis about which the blade is pivoted. When the clamp has been forced against the cover margin upon the support as above described, the cutting blade continues to move downwardly about its axis, the rollA carried by the blade engaging the cylindrical surface of the clamp and insuring that the clamp shall be held in forced engagement with the cover margin on the support while the blade is swung downwardly with relation to the clamp and past the shearing edge of the support to trim off a portion of the margin extending beyond said shearing edge.

With the above arrangement, an operator can trim the projecting margin -of the cover to the proper width for application to the breast of the heel and insertion into the channel formed in said breast quicker and more effectively than heretofore. Moreover, in operating the above machine, it is impossible for the operator to be accidentally cut by the knife during the trimming operation.

The various features of the invention willbe understood and appreciated from the following detailed description read in connection with the chine;

Fig. 3 is'a perspective view showing portions of the machine in the process of trimming a forwardly projecting margin of a cover attached to a Cuban heel to prepare said cover margin for application to the heel breast and for tucking into a channel formed in said breast; and

Fig. 4 shows, in perspective, the heel after the trimmed projecting margins of the cover have been applied thereto.

The illustrative machine is described with reference to trimming the forwardly projecting margins 20 (Fig. 3 and 4) of a cover 22, which has been applied to the rearand side faces' of a Cuban heel 24, to the proper width for insertion in a channel 26 (Fig. 4) formed in the breast oi the heel.

The machine comprises a work support 28 against which each of the projecting margins 20 of the cover 22 of the heel is forced by a measuring clamp 30 preparatory to trimming a portion of the margin extending beyond a shearing edge 32'of the support by a cutting blade or knife 34 having a shearing edge 36 (Fig. 3).

Aswill appearlater, the heel 24 is positioned with relation to the support 28 by a projecting rib 38 which is secured by screws 40 to the support and occupies the channel 26 formed in the breast of the heel. After the heel 24 has been positioned with relation to the support 28, the clamp 30, which comprises a replaceable foot 42 (Fig. 3), is moved downwardly past the upper breast edge of the heel, causing the upper forwardly projecting margin 20 vof the cover to be bent to an L-shaped cross section (Fig. 3), the portion of the margin extending beyond the shea-ring edge 32 of the support 28 being the amount of surplus material to be trimmed from the cover by the cutting blade 34.

The work support 28 is secured by cap screws 44 to an L-shaped angle bar 46 secured to a bench (not shown) Welded or otherwise secured to the support 28 is a block 48 bored for receiving a bearing sleeve 50 (Fig. 2) constructed and arranged to support a fulcrum pin 52 one end of which is provided with a head 54 and the other end of which projects beyond the bearing sleeve and has secured to it by a set-screw 56 a collar 58. Threaded into the head 54 of the fulcrum pin 52 are a pair of screws 60, and surrounding the bearing sleeve 50 and interposed between the collar 58 and the block 48 is a bladeretracting coil spring 62 opposite ends of which are secured to the collar and to the block, respectively. 'I'he blade 34 is mounted upon the Screws 60, recesses in the blade being provided for this purpose, said blade being clamped against the head 54 of the fulcrum pin 52 by nuts 64 threaded onto the screws 60. Also mounted upon the screws 60 is an operating arm 66 which is bored for receiving said screws and is secured upon the screws by another pair of nuts 68 which serve to clamp the arm against the nuts 64. The blade 34, together with its operating arm 65, is held in a raised position against a stop by the spring 62 which is'strong and is initially tensioned for this purpose.

Secured through a screw and nut connection 12 to the forward end of the operating arm 66 is a handle T4 by which the cutting blade 34 is moved downwardly past the shearing edge 32 of the support 28 about the axis 16 of the fulcrum pin 52 to remove surplus material from the heel cover. Downward movement of the .cutting blade 34 is limited by the engagement of said blade with a stop '18. If desirable, the handle 14 may be released after the cover has been trimmed,'

the arrangement being such that upon the release of such handle the blade 34fis raised by the spring 62 to its starting position against the stop 10.

Mounted upon the operating arm 66 is an angle lug which has secured to it a block 82 carrying a cam roll 84, the angle lug being provided with elongated slots 86 through which pass screws 88 carried by the operating arm. In setting up the machine, the lug 80 is initially positioned upon the operating arm 66 and is then clamped securely thereto by nuts 90 threaded onto the screws 88.

Secured to the block 48 by cap screws 92 is a smaller block 94 bored to receive a fulcrum pin 96 provided with a circular iiange 98. The fulcrum pin 96 passes through a bore in the measuring clamp 30, the flange 98 registering in a countersunk portion of the clamp. The clamp 30 is forced against the flange 98 of the fulcrum pin 96 by a washer |00 backed up by a nut |02 threaded onto the 'fulcrum pin. In order to insure against any turning movement of the measuring clamp 38 with relation to the fulcrum pin 96, there is provided a dowel |04 which fits in alined recesses in the washer |00, the clamp 30, and the flange 98 of the fulcrum pin 96.

The measuring clamp 30 is normally held in a raised position, with its upper cam surface |06 in engagement with the roll 84, by a coil spring |08, somewhat weaker than the spring 62'which surrounds a spacer sleeve ||0 mounted upon the fulcrum pin 96 and which has one of its ends anchored in the block 94 and its other end anchored in a collar |2 secured by a setscrew ||4 to the fulcrum pin 96. The measuring clamp 30. including the replaceable foot 42 thereof, is practically the same width as the cover-engaging face of the support 28 but is set back slightly inside the shearing edge 32 'of the support in order to insure that the cutting edge 36 of the blade shall co-operate effectively with the shearing edge 32 of the support to trim off the projecting cover margin. The face of the support underlying the shearing edge 32 is undercut about 5 to insure that such face shall not interfere with the proper co-operation between the cutting edge of the blade 34 and the shearing edge 32, the cutting edge of the blade being curved slightly inwardly so as at all times to engage with considerable pressure the portion of the shearing edge at 'wardly the forwardly projecting margin of the cover not being trimmed, thereby insuring against any possibility of the untrimmed lower portion of the margin being engaged by the cutting blade 34.

The measuring clamp 30 comprises a cylindrical cam surface ||8 (Fig. 1), which is eccentric to the axis |20 (Fig. 2) of the fulcrum pin 96, and also the upper cam surface |06 which is disposed angularly to said cylindrical cam surface. When the cutting blade 34 is held against the stop 10, the cam surface |06 of the measuring clamp 30 is in engagement with the roll 84, the cutting blade 34 at this time, as above stated, being held in its raised position by the relatively strong spring 62 and the measuring clamp 30 being held against the roll by the somewhat weaker spring |08.

The cylindrical surface 8 of the clamp 30, which, as above described, is eccentric to the axis 20 about which the clamp 30 is swiveled,

52 except when the clamp is in engagement with the support 28, at which time the said cylindrical surface is concentric with the axis it.

When the operator depresses the handle 14, the roll 84, operating against the upper surface Iil of the measuring clamp 3B, causes said clamp to be moved downwardly into forced engagement with the cover' margin 2i) upon the support 28, the cylindrical cam surface IIB of the measuring clamp 30 at that time being practically concentric with the axis 16 of the fulcrum pin 52.

The construction and arrangement of the cam roll 84 and the upper surface Ill of the measuring clamp 3i] are such that when pressure has been exerted against the margin of the cover by the clamp the roll has just ridden over onto the cylindrical surface IIB. Further downward movement of the handle "Irl, and therefore of the cutting blade Sii, causes the roll Bt to run downwardly along the cylindrical surface IIB of the measuring clamp Sil. the cutting blade 3ft cooperating with the shearing edge 32 of the support 28 to trim the projecting margin 2i) of the cover 22, which has been bent as above described, to the proper width.

Since the cylindrical surface I I3 of the measuring clamp 3u in its work clamping position is arranged just out of concentricity with the axis 16, it will be appreciated that the roll 84, as it moves along the cylindrical surface while the cutting blade 34 is trimming the material, will hold the clamp securely against the work. Moreover, the construction and arrangement of the roll 84 and the surfaces iIlI, I I8 of the measuring clamp 3l) with which said roll engages are such that the cutting blade all cannot be moved into shearing relation to the work until the clamp 30 has been pressed against said work. Accordingly, there is no possibility of the operator cutting his fingers in operating the machine, since the cutting blade 3d cannot be moved across the shearing edge 32'; of 'the work support 28, regardless of the pressure applied, until the measuring clamp 3Q has been brought down into engagement with the Work.

Having described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

l. In a trimming machine, a work support provided with a shearing edge, means for positioninfr with reiation to the support a heel havinga cover-receiving channel. a clamp for positioning rpon said support a projecting margin of a cover .secured to the heel, a cutting blade movable past the shearing edge of the support to trim portions ci the cover margin extending beyond said shearing edge and means associated with the cutting clade and the clamp for operating the clamp in response to movement of the cutting blade to 'force said projecting margin of the cover against the support'and then for causing the clamp to remain practically stationary in forced engagement with the cover margin while said blade trims surplus material from said margin.

2. A trimming machine comprising a support, a measuring clamp constructed and arranged to force a work piece against the support, a cutting blade co-operating with the support to remove material from the work piece., and mechanism responsive to movement of said blade for positively preventing movement of said blade to trim the work piece on the support unless the clamp is in forced engagement with the work piece.

3. A trimming machine comprising a support for a projecting margin of a cover secured to a Wood heel which is provided with a channel for receiving a portion of saidcover margin, a rib constructed and arranged to occupysaid channel to position the heel with relation to the support, a clamp for positioning the projecting margin of the cover of said heel upon the support and for forcing said margin against the support, a movable cutting blade for trimming surplus material from said .positioned cover margin, and means associated with the cutting blade and the clamp for causing the clamp to be moved in response to movement of the cutting blade.

4. In a trimming machine, a support for a work piecea clamp for forcing said work piece against the support, a cutting blade for trimming surplus material from said work piece, said clamp and said blade being movable about spaced parallel axes, resilient means for constantly urging the clamp and the cutting blade toward inoperative positions away from the support, and a roll movable with the cutting blade, said clamp having a cam surface which is contacted by said roll and which is so constructed and arranged that during trimming movement of said blade the clamp is forced against the work piece upon the support and thereafter holds the work piece against the support while the blade trims surplus material from the Work piece.

5. A trimming machine comprising a support for a projecting portion of a cover attached to a heel which is provided with a channel for receiving a trimmed margin of said projecting portion, said support having a shearing edge, .a cutting blade movable past the shearing edge of the support, a gage constructed and arranged to occupy the channel in the heel for positioning said heel with relation to the support, a member for clamping the projecting portion of the cover against the support and for measuring said portion to widths suitable for tucking into the channel, and means movable in response to movement of the cutting blade for causing said member to force the margin of the cover against the support and for enabling the blade to be moved with relation to the clamping member past the shearing edge of the support while maintaining said member in clamping relation with the cover margin to remove material from said margin.

6. -In'a trimming machine, a support, a rib constructed and arranged to occupy a channel in a heel to position said heel with relation to the support, a clamp for forcing a projecting margin of a cover which is attached to the heel against the support, a cutting blade co-operating with the support to trim surplus material from Athe clamped projecting `margin of said cover, and

a roll movable in response to movement of the blade and constructed and arranged upon movement of said blade to co-operate with portions of the clamp first to cause the clamp to be forced into engagement with the projecting margin of the cover upon the support and then to cause the clamp to be held in forced engagement with said cover margin while the cutting blade cooperates with the support to trim surplus material from the projecting cover margin.

'7. In a trimming machine, a support for a work niece, a clamp vfor forcing the work piece against the support, a cutting blade co-operating with the support to remove material from the work piece, said clamp and said blade being mounted for movement about spaced parallel axes respectively, said clamp having a cylindrical surface which when the clamp is in engagement with the work piece is centered approximately about the axis about which the cutting blade is fulcrumed, said clamp having a surface which is an'giil'arly disposed to the cylindrical surface, and a roll 'movable with said blade, said roll and said angularly disposed surface of the clamp being spo constructed and arranged that upon the cutting stroke of said blade toward the Work support the roll operating against the angularly disposed surface of the clamp causes the clamp to force the work piece against the support and then moves into engagement with and runs along the cylindrical surface of the clamp to hold said clamp in engagement with the work piece While the blade removes material from said Work piece.

8. In a trimming machine, a support for a work piece, said support having a shearing edge, a clamp for forcing the work piece against the support, a cutting blade co-operating with the shearing edge of the support to trim the Work piece, said clamp and said blade being movable about spaced parallel axes, and an element movable in response to movement of said cutting blade, said clamp having a surface against which pressure is applied by said element during the first part of the downward stroke of the blade about its axis to move the clamp about its axis and to force the clamp against the work piece, said clamp also having a cylindrical surface against which pressure is applied by said element during a later part of the cutting stroke of the blader to retain the'clamp in forced engagement with the work piece While the Work piece is being trimmed, the cylindrical surface of the clamp being eccentric to the axis about which the clamp is moved but being approximately concentric with the axis about which the cutting blade is moved when the clamp is in engagement with the Work piece on the support.

FRED CHASE LOVEJOY. LINUS WALDO BUX'ION. 

